Hello there!
Here are a couple of suggestions to try:
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Make sure WeMod is added as an exception in your antivirus program, even if it’s just the default Windows Defender. Erratic behaviour is very commonly due to interference from security programs on the user’s computer or network.
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Make sure you have the latest version of .NET Framework. There have been reports in the past of people upgrading to Windows 10 or re-installing Windows 10 stating that Windows did not update/re-install .NET Framework. It’s possible this could still be happening, but now for Windows 11 too.
For steps and advice for both of these suggestions, see this thread here: I can’t Install WeMod / “There was a error installing the application” - WeMod App / Support. The title is different to your issue, but the steps are the same.